unit heater - Irby
type muh
uNit heateR
FILE #E21609
• Unit mounts either horizontally or vertically. Totally versatile. For factories, warehouses, garages, stores, shipping rooms, power stations, aircraft hangers. Can be used for primary, supplementary, spot, or dual-system heating. • Wide range of optional control kits are field installable, increasing the MUH adaptability to the specification market. • Forced air unit heater with 10 power ratings; from 3KW to 50 KW heating output; 208, 240, 277 and 480V, 10,230 to 170,500 BTU/hr. • 32 compatible models (no need to try to assemble a heating system from 70 or 80 models!) • Heavy gauge die-formed steel housing. Two-toned, smartly styled.
• Aluminum-finned, copper clad steel sheath heating element has longer useful life, because of cooler sheath temperature and faster heat dissipation. • 24V control transformer standard on most models, providing a safer and more accurate means of temperature control. 3KW and 5KW, 208-277V, have line voltage controls as standard (24V control available on made-to-order basis). • Automatic reset linear thermal cut-out, capillary type, provides protection over entire length of element areas (Manual reset protection available on made-to-order basis). • 2-speed fan selector switch (25 to 50 KW models). • Fan delay feature eliminates cold drafts. Element heats up before fan cuts in, then fan continues to distribute heat after element shuts off.
• Advanced pull-through air flow design draws air across heating element for more even air distribution and cooler element operation.
• Ruggedly built, yet lighter weight for easier installation. No piping flues, valves, or traps.
• Specially designed venturi outlet to meet that added throw as required in vertical position.
• Individually adjustable discharge louvers to control air flow.
• Branch circuit fusing (when required).
• Choice of optional diffusers for variety of air patterns, maximizing heat concentration and coverage in the vertical position.
• Completely enclosed fan motor. • 1- or 3-phase wiring on 5 through 10 KW 208/240V and 15 KW 208V units (field interchangeable).
• Meets all UL, NEC, and OSHA requirements.
SeLectioN chaRt maximum effective mouNtiNg height
btu/hR. 000
ampS (3)
coNtRoL voLt (1)
2 Stage eLemeNt coNtRoL
cfm(2)
fpm(2)
∆t(°f)
voLtS
Rpm(2)
hp
hoRiz.
veRt.
hoRi. aiR thRow
wiRe Size
iNStaLLeD weight (LbS.) w/bRack.
3.0 2.2/3.0 3.0 3.0 3.0 3.0
10.2 7.5/10.2 10.2 10.2 10.2 10.2
14.5 11.0/12.5 11.0 8.6 3.6 2.9
208 208/240 277 347 24 600
N/A N/A N/A N/A N/A N/A
350 350 350 350 350 350
800 800 800 800 800 800
27 ° 27 ° 27 ° 27 ° 27 ° 27 °
208 208/240 277 347 480 600
1600 1600 1600 1600 1600 1600
1/100 1/100 1/100 1/100 1/100 1/100
8 8 8 8 8 8
9 9 9 9 9 9
12 12 12 12 12 12
AWG 12 AWG 12 AWG 14 AWG 14 AWG 14 AWG 14
27 27 27 27 27 27
1-3Ø 1-3Ø 1Ø 1Ø 3Ø 3Ø
5.0 3.7/5.0 5.0 5.0 5.0 5.0
17.0 12.6/17.0 17.0 17.0 17.0 17.0
24.0 18.0/21.0 18.0 14.4 6.0 4.8
208 208/240 277 347 24 600
5A 5A N/A N/A N/A N/A
350 350 350 350 350 350
800 800 800 800 800 800
45 ° 45 ° 45 ° 45 ° 45 ° 45 °
208 208/240 277 347 480 600
1600 1600 1600 1600 1600 1600
1/100 1/100 1/100 1/100 1/100 1/100
8 8 8 8 8 8
9 9 9 9 9 9
12 12 12 12 12 12
AWG 10 AWG 10 AWG 10 AWG 10 AWG 14 AWG 10
27 27 27 27 27 27
208 208/240 277 347 480 600
1-3Ø 1-3Ø 1Ø 1Ø 3Ø 3Ø
7.5 5.6/7.5 7.5 7.5 7.5 7.5
25.6 19.1/25.6 25.6 25.6 25.6 25.6
36.0 27.0/31.3 27.0 21.6 9.0 7.3
24 24 24 24 24 24
5B 5B 5B 5B 5B 5B
650 650 650 650 650 650
970 970 970 970 970 970
37 ° 37 ° 37 ° 37 ° 37 ° 37 °
208 208/240 277 347 480 600
1600 1600 1600 1600 1600 1600
1/30 1/30 1/30 1/30 1/30 1/30
9 9 9 9 9 9
14 14 14 14 14 14
18 18 18 18 18 18
AWG 6 AWG 8 AWG 8 AWG 14 AWG 14 AWG 14
38 38 38 38 38 38
muh-10-8 muh-10-2 muh-10-7 muh-10-3 muh-10-4 muh-10-6
208 208/240 277 347 480 600
1-3Ø 1-3Ø 1Ø 1Ø 3Ø 3Ø
10.0 7.5/10.0 10.0 10.0 10.0 10.0
34.1 25.6/34.1 34.1 34.1 34.1 34.1
48.0 36.0/42.0 36.0 28.8 12.0 9.7
24 24 24 24 24 24
5B 5B 5B 5B 5B 5B
650 650 650 650 650 650
970 970 970 970 970 970
49 ° 49 ° 49 ° 49 ° 49 ° 49 °
208 208/240 277 347 480 600
1600 1600 1600 1600 1600 1600
1/30 1/30 1/30 1/30 1/30 1/30
9 9 9 9 9 9
14 14 14 14 14 14
18 18 18 18 18 18
AWG 4 AWG 6 AWG 6 AWG 14 AWG 14 AWG 14
38 38 38 38 38 38
muh-15-8 muh-15-2 muh-15-4 muh-15-6
208 208/240 480 600
1-3Ø 3Ø 3Ø 3Ø
15.0 11.2/15.0 15.0 15.0
51.2 38.2/51.2 51.2 51.2
72.0 31.3/36.1 18.0 14.5
24 24 24 24
5A 5C 5C 5C
910 910 910 910
1640 1640 1640 1640
52 ° 52 ° 52 ° 52 °
208 208/240 480 600
1530 1530 1530 1530
1/20 1/20 1/20 1/20
11 11 11 11
20 20 20 20
35 35 35 35
AWG 2 AWG 6 AWG 10 AWG 12
53 53 53 53
muh-20-8 muh-20-2 muh-20-4 muh-20-6
208 208/240 480 600
3Ø 3Ø 3Ø 3Ø
20.0 15.0/20.0 20.0 20.0
68.2 51.2/68.2 68.2 68.2
56.0 41.2/48.0 24.0 19.3
24 24 24 24
5A 5C 5C 5C
1320 1320 1320 1320
2060 2060 2060 2060
48 ° 48 ° 48 ° 48 °
208 208/240 480 600
1500 1500 1500 1500
1/10 1/10 1/10 1/10
12 12 12 12
23 23 23 23
41 41 41 41
AWG 4 AWG 4 AWG 10 AWG 12
60 60 60 60
muh-25-2 muh-25-4 muh-25-6
208/240 480 600
3Ø 3Ø 3Ø
18.7/25.0 25.0 25.0
63.8/85.2 85.2 85.2
52.0/60.0 30.0 24.2
24 24 24
5A 5C 5C
2100/1800 2100/1800 2100/1800
2100/2030 2100/2030 2100/2030
38 °/44 ° 38 °/44 ° 38 °/44 °
208/240 480 600
1600/1375 1600/1375 1600/1375
1/4 1/4 1/4
13 13 13
23 23 23
50 50 50
AWG 3 AWG 8 AWG 10
93 93 93
muh-30-8 muh-30-2 muh-30-4 muh-30-6
208 208/240 480 600
3Ø 3Ø 3Ø 3Ø
30.0 22.5/30.0 30.0 30.0
102.3 76.7/102.3 102.3 102.3
84.0 63.0/72.3 36.0 29.0
24 24 24 24
5A 5A 5C 5C
2100/1800 2100/1800 2100/1800 2100/1800
2100/2030 2100/2030 2100/2030 2100/2030
45 °/53 ° 45 °/53 ° 45 °/53 ° 45 °/53 °
208 208/240 480 600
1600/1375 1600/1375 1600/1375 1600/1375
1/4 1/4 1/4 1/4
12 12 12 12
20 20 20 20
50 50 50 50
AWG 1 AWG 2 AWG 6 AWG 8
93 93 93 93
muh-40-2 muh-40-4 muh-40-6
208/240 480 600
3Ø 3Ø 3Ø
30.0/40.0 40.0 40.0
102.3/136.4 136.4 136.4
83.4/96.4 48.0 38.7
24 24 24
5A 5A 5A
3000/2600 3000/2600 3000/2600
3260/2900 3260/2900 3260/2900
42 °/49 ° 42 °/49 ° 42 °/49 °
208/240 480 600
1525/1420 1525/1420 1525/1420
1/2 1/2 1/2
15 15 15
28 28 28
60 60 60
AWG 1/0 AWG 4 AWG 6
114 114 114
muh-50-8 muh-50-2 muh-50-4 muh-50-6
208 208/240 480 600
3Ø 3Ø 3Ø 3Ø
50.0 37.5/50.0 50.0 50.0
170.5 139.0 127.3/170.5 104.2/120.4 170.5 60.2 170.5 48.3
24 24 24 24
5A 5A 5A 5A
3000/2600 3000/2600 3000/2600 3000/2600
3260/2900 3260/2900 3260/2900 3260/2900
53 °/61 ° 53 °/61 ° 53 °/61 ° 53 °/61 °
208 208/240 480 600
1525/1420 1525/1420 1525/1420 1525/1420
1/2 1/2 1/2 1/2
15 15 15 15
25 25 25 25
60 60 60 60
AWG 4/0 AWG 3/0 AWG 4 AWG 3
114 114 114 114
eLectRicaL Data cat. No.
voLtS
phaSe
kw
muh03-81 muh03-21 muh03-71 muh03-31 muh03-41 muh03-61
208 208/240 277 347 480 600
1Ø 1Ø 1Ø 1Ø 3Ø 3Ø
muh05-81 muh05-21 muh05-71 muh05-31 muh05-41 muh05-61
208 208/240 277 347 480 600
muh-07-8 muh-07-2 muh-07-7 muh-07-3 muh-07-4 muh-07-6
aiR DeLiveRy Data
Note: 1. All standard units are supplied with a low voltage control transformer and contactor (24V) except MUH-03 & 05, 208, 240 & 277 volt models. Low voltage control on these units are available on made to order. All units are also available on special order for 120 volt control; internal and transformer or external without transformer. 2. On dual voltage units; CFM, FPM, and RPM are shown at higher voltage.
ZBL-QMUHO
10-06
faN motoR Data
3. 4. 5A. 5B. 5C.
On dual phase units, maximum amp draw is listed for respective voltage. 25 thru 50 KW models have two speed motors and dual CFM ratings. Standard. Optional - made to order - amp load unbalanced on 3 Phase. Optional - made to order - amp load balanced on 3 Phase.
acceSSoRieS DeScRiptioN
cataLog #
eLectRicaL RatiNg
uSe with heateR No.
mt-1
Single Pole Internal Thermostat Temp. Range: 40°F - 85°F
25A; 120, 240V. A.C. Res. 22A; 277V.A.C. Res.
All MUH Series Heaters (except MUH05-21 3Ø and mUH025-81 3Ø, which use MT-2).
mt-2
Two Stage Internal Thermostat Temp. Range: 40°F - 85°F
MUH05-21 3Ø, MUH05-81 3Ø, MUH-15-8, MUH-20-8, MUH-25-2, MUH-30-2, MUH-30-8, MUH-40-2, MUH-50-2, MUH-50-4, MUH-50-8
mcfS mRfS-1
Internal Summer Fan Switch
25A; 120, 240V. A.C. Res. 22A; 277V.A.C. Res. 125V.A; Pilot Duty 6A; 600V.A.C. Res. 2 HP; 250, 480, 600V.A.C. 1, 2, or 3Ø 2 HP; 250-480V.A.C. 6 AFL, 35 ALR, 250V.A.C. 60 Hz 3 AFL, 18 ALR, 480V.A.C. 60 Hz 6 AFL, 35 ALR, 250V.A.C. 60 Hz 3 AFL, 18 ALR, 480V.A.C. 60 Hz
All MUH Series Heaters (except MUH03-21, MUH03-71, MUH03-81, MUH05-21, MUH05-71, MUH05-81 Units, unless optional control transformer is supplied.
mpDS-25 Power Disconnect Switch (3 Pole)
25A, 600V.A.C. Res.
MUH03-21, MUH03-41, MUH03-71, MUH03-81, MUH05-21, MUH05-41, MUH05-71, MUH05-81, MUH-07-4, MUH-10-4, MUH-15-4, MUH-20-4
mpDS-60 Power Disconnect Switch (3 Pole)
63A, 600V.A.C. Res.
MUH-07-02, MUH-07-7, MUH-07-8, MUH-10-2 ,MUH-10-7, MUH-10-8, MUH-15-2 MUH-15-8 3Ø only, MUH-20-2, MUH-20-8, MUH-25-2, MUH-25-4, MUH-30-4 MUH-40-4, MUH-50-4
NRfS-2 mhRt
Remote Summer Fan Switch (Line Voltage) Remote Summer Fan Switch with Relay (24V Coil-Single Pole Normally Open) Heater Recovery Thermostat with Relay (24V Coil-Single Pole Normally Open) Hi — 120°F; Low — 60°F
uNiveRSaL waLL & ceiLiNg bRacket cataLog No.
uSeD oN
All MUH Series Heaters All MUH Series Heaters All MUH Series Heaters (except MUH03-21, MUH03-71, MUH03-81, MUH05-21, MUH05-71, MUH05-81 Units, unless optional control transformer is supplied.
bRacket Size DimeNSioN
3 - 20kw
25 - 50kw
optioNaL buiLt-iN coNtRoLS aND acceSSoRieS oN muh heateRS factoRy iNStaLLeD oNLy††
mmb-10
MUH-03, 05, 07 & 10
a
71/4”
97/16”
mmb-20
MUH-15 & 20
b
91/2”
143/8”
DeScRiptioN
mmb-30
MUH-25 & 30
c
71/4”
121/8”
mmb-50
MUH-40 & 50
D
115/16”
21/16”
MUH-03 & 05 (208, 208/240, 277V Supply) 24 or 120V Control Transformer and Power Contactor 24 or 120V H.C. Power Contactor
e
21/4”
3”
L
201/2”
2815/16”
MUH-03 & 05 (480V Supply) & MUH-07 thru MUH-50, Optional 120V Control
m
915/16”
1415/16”
2-Stage Control of Elements (See Note 5)
N
31/4”
41/2”
ceiLiNg bRacket cataLog No.
uSeD oN
mcmb-10
MUH-03, 05, 07 & 10
mcmb-20
MUH-15 & 20
mcmb-30
MUH-25 & 30
mcmb-50
MUH-40 & 50
Manual Reset. Outlet Mesh (Bird Screen) For all MUH Heaters
optioNaL veRticaL ceiLiNg mouNtiNg bRacket cataLog NumbeR
uSeD oN
mvDmb5
MUH03-05
1
5
mvDmb20
MUH07-20
1
mvDmb50
MUH25-50
1
mouNtiNg LimitatioNS Unit heaters should not be used in potentially explosive atmospheres. The finish is not intended for direct salt spray exposure in marine applications or the highly corrosive atmospheres of swimming pools, chemical storage bins, etc. Do not install unit heaters above recommended maximum mounting height. Obstructions must not block unit heater air inlet or discharge. Heaters must be mounted at least 7’ above the floor to prevent accidental contact with the heating element or fan blade which could cause injury.
2
StaNDaRD caRtoN Qty. wt. LbS.
††Optional built-in controls and accessories factory installed only - Not to be field installed
DimeNSioNS cat. No.
height
muh-03 & 05
16”
wiDth Depth 14”
7
muh-07 & 10
213/4”
19”
71/2”
9
muh-15 & 20
213/4”
19”
123/4”
muh-25 & 30
30”
265/8”
113/4”
muh-40 & 50
30”
265/8”
171/8”
71/2”
DiffuSeR SeLectoR tabLeS foR veRticaL mouNtiNg cataLog No. NoNe NoNe NoNe NoNe NoNe NoNe
DeScRiptioN WITHOUT DIFFUSER No diffuser needed where a straight downflow air pattern is required. For maximum air throw, remove louvers. Any of three diffusers can be added to basic heater.
NoNe NoNe maD-S maD-m maD-m maD-m maD-L maD-L maD-L maD-L mLD-S mLD-m mLD-m mLD-m mLD-L mLD-L
ANEMOSTAT DIFFUSER The “comfort” diffuser. Produces draft-free air movement at low mounting heights. Floor coverage shown in table.
LOUVER DIFFUSER Permits directional (straight line) air flow as in air curtain application over doorways. Rectangular coverage, Louvers can be turned in either direction.
mLD-L mLD-L mRD-S mRD-m mRD-m mRD-m mRD-L mRD-L mRD-L mRD-L
cataLog No.
max. mNt. ht.
a DimeNSioN
muh-03 &muh-05 muh-07 & muh-10
9 14
18 26
muh-15 muh-20 muh-25 muh-30
20 23 23 20
35 40 63 55
muh-40 muh-50
28 25
70 63
muh-03 & muh-05 muh-07 & muh-10
8 12
18 28
muh-15 muh-20
15 17
35 40
muh-25 muh-30
19 17
60 55
muh-40 muh-50 muh-03 & muh-05 muh-07 & muh-10
22 20 9 14
77 70 25(A) 39 (A)
12(B) 19(B)
muh-15 muh-20
18 20
50(A) 56(A)
25(B) 28(B)
muh-25 muh-30
23 20
72(A)
36(B)
muh-40 muh-50
24 22
88(A) 80(A)
44(B) 40(B)
muh-03 & muh-05 RADIAL DIFFUSER muh-07 & muh-10 Increases floor coverage. Adjustable muh-15 fins, in vertical mode, direct muh-20 downward in a tight pattern. muh-25 Conversely, when fins are tilted to muh-30 45° angle, floor coverage is up to 25% greater at relatively low muh-40 mounting heights. muh-50
9 14
20 31
18 20
40 45
23 20
69 60
24 22
75 68
DiffuSeR patteRN aND aRea
type muh-35
uNit heateR FILE #E21609 • Mounts either on the wall or from the ceiling can be used for primary or spot heating. For factories, garages, schools, etc.
• Advanced pull-through air flow design draws air across heating element for more even air distribution and cooler element operation.
• Airflow can be directed horizontally, vertically or any position between for precise control.
• Specially designed venturi outlet to meet that added throw as required in vertical position.
• Multiple wattage heat selector switch. Either 5KW or 3.3KW @ 240V (3.7KW or 2.5KW @ 208V) for just the right amount of heat. • Fan only switch allows fan to cycle automatically with elements or run continuously for air movement when no heat is required. • Built-in bi-metal thermostat. Range 40° to 90°F. • Heater is shipped with ceiling/wall bracket. • Heavy gauge die-formed steel housing.
• Completely enclosed fan motor. • Aluminum-finned, copper clad steel sheath heating element has longer useful life, because of cooler sheath temperature and faster heat dissipation. • Automatic reset linear thermal cut-out capillary type, provides protection over entire length of element area. • Ruggedly built, yet lighter weight for easier installation. No piping flues, valves, or traps. • Meets all UL, NEC, and OSHA requirements.
3
SeLectioN chaRt cataLog NumbeR
muh-35
eLectRicaL Data voLtS
phaSe
240/208
1
aiR DeLiveRy Data
faN motoR Data
2 Stage coNtRoL eLemeNt coNtRoL voLtage
cfm
fpm
t(°f)
voLtS
Rpm
5.0/3.7 17.0/12.6 21.0/18.0 17.0/12.6 MUH-35
210
550
71°
240/208
1600
kw
btu/hR (000)
ampS
maximum effective mouNtiNg height
hp
hoRiz.
veRt.
hoRiz. aiR thRow
wiRe Size
iNStaLLeD weight (lbs) w/ bRacket
/100
8
51
24
AWG 10
22
1
aRchitect’S aND eNgiNeeR’S SpecificatioNS* • Unit mounts either horizontally or vertically. Totally versatile. For factories, warehouses, garages, stores, shipping rooms, power stations, aircraft hangers. Can be used for primary, supplementary, spot, or dual-system heating. Wide range of optional control kits are field installable, increasing the MUH adaptability to the specification market. • Forced air unit heater with 10 power ratings; from 3KW to 50 KW heating output; 208, 240, 277 and 480V, 10,230 to 170,500 • BTU/hr. • 32 compatible models (no need to try to assemble a heating system from 70 or 80 models!) • Heavy gauge die-formed steel housing. Two-toned, smartly styled. • Advanced pull-through air flow design draws air across heating element for more even air distribution and cooler element operation. Specially designed venturi outlet to meet that added throw as required in vertical position. • Branch circuit fusing (when required). • Completely enclosed fan motor. • 1or 3-phase wiring on 5 through 10 KW 208/240V and 15 KW 208V units (field interchangeable). • Aluminum-finned, copper clad steel sheath heating element has longer useful life, because of cooler sheath temperature and • faster heat dissipation. • 24V control transformer standard on most models, providing a safer and more accurate means of temperature control. 3KW and 5KW, 208-277V, have line voltage controls as standard (24V control available on made-to-order basis). Automatic reset linear thermal cut-out, capillary type, provides protection over entire length of element areas (Manual reset • protection available on made-to-order basis). • 2-speed fan selector switch (25 to 50 KW models). • Fan delay feature eliminates cold drafts. Element heats up before fan cuts in, then fan continues to distribute heat after element shuts off. Ruggedly built, yet lighter weight for easier installation. No piping flues, valves, or traps. • Individually adjustable discharge louvers to control air flow. • Choice of optional diffusers for variety of air patterns, maximizing heat concentration and coverage in the vertical position. • Meets all UL, NEC, and OSHA requirements. • *QMark reserves the right to make changes without prior notice.
470 Beauty Spot Road East Bennettsville, SC 29512
uNit heateR
FILE #E21609
• Unit mounts either horizontally or vertically. Totally versatile. For factories, warehouses, garages, stores, shipping rooms, power stations, aircraft hangers. Can be used for primary, supplementary, spot, or dual-system heating. • Wide range of optional control kits are field installable, increasing the MUH adaptability to the specification market. • Forced air unit heater with 10 power ratings; from 3KW to 50 KW heating output; 208, 240, 277 and 480V, 10,230 to 170,500 BTU/hr. • 32 compatible models (no need to try to assemble a heating system from 70 or 80 models!) • Heavy gauge die-formed steel housing. Two-toned, smartly styled.
• Aluminum-finned, copper clad steel sheath heating element has longer useful life, because of cooler sheath temperature and faster heat dissipation. • 24V control transformer standard on most models, providing a safer and more accurate means of temperature control. 3KW and 5KW, 208-277V, have line voltage controls as standard (24V control available on made-to-order basis). • Automatic reset linear thermal cut-out, capillary type, provides protection over entire length of element areas (Manual reset protection available on made-to-order basis). • 2-speed fan selector switch (25 to 50 KW models). • Fan delay feature eliminates cold drafts. Element heats up before fan cuts in, then fan continues to distribute heat after element shuts off.
• Advanced pull-through air flow design draws air across heating element for more even air distribution and cooler element operation.
• Ruggedly built, yet lighter weight for easier installation. No piping flues, valves, or traps.
• Specially designed venturi outlet to meet that added throw as required in vertical position.
• Individually adjustable discharge louvers to control air flow.
• Branch circuit fusing (when required).
• Choice of optional diffusers for variety of air patterns, maximizing heat concentration and coverage in the vertical position.
• Completely enclosed fan motor. • 1- or 3-phase wiring on 5 through 10 KW 208/240V and 15 KW 208V units (field interchangeable).
• Meets all UL, NEC, and OSHA requirements.
SeLectioN chaRt maximum effective mouNtiNg height
btu/hR. 000
ampS (3)
coNtRoL voLt (1)
2 Stage eLemeNt coNtRoL
cfm(2)
fpm(2)
∆t(°f)
voLtS
Rpm(2)
hp
hoRiz.
veRt.
hoRi. aiR thRow
wiRe Size
iNStaLLeD weight (LbS.) w/bRack.
3.0 2.2/3.0 3.0 3.0 3.0 3.0
10.2 7.5/10.2 10.2 10.2 10.2 10.2
14.5 11.0/12.5 11.0 8.6 3.6 2.9
208 208/240 277 347 24 600
N/A N/A N/A N/A N/A N/A
350 350 350 350 350 350
800 800 800 800 800 800
27 ° 27 ° 27 ° 27 ° 27 ° 27 °
208 208/240 277 347 480 600
1600 1600 1600 1600 1600 1600
1/100 1/100 1/100 1/100 1/100 1/100
8 8 8 8 8 8
9 9 9 9 9 9
12 12 12 12 12 12
AWG 12 AWG 12 AWG 14 AWG 14 AWG 14 AWG 14
27 27 27 27 27 27
1-3Ø 1-3Ø 1Ø 1Ø 3Ø 3Ø
5.0 3.7/5.0 5.0 5.0 5.0 5.0
17.0 12.6/17.0 17.0 17.0 17.0 17.0
24.0 18.0/21.0 18.0 14.4 6.0 4.8
208 208/240 277 347 24 600
5A 5A N/A N/A N/A N/A
350 350 350 350 350 350
800 800 800 800 800 800
45 ° 45 ° 45 ° 45 ° 45 ° 45 °
208 208/240 277 347 480 600
1600 1600 1600 1600 1600 1600
1/100 1/100 1/100 1/100 1/100 1/100
8 8 8 8 8 8
9 9 9 9 9 9
12 12 12 12 12 12
AWG 10 AWG 10 AWG 10 AWG 10 AWG 14 AWG 10
27 27 27 27 27 27
208 208/240 277 347 480 600
1-3Ø 1-3Ø 1Ø 1Ø 3Ø 3Ø
7.5 5.6/7.5 7.5 7.5 7.5 7.5
25.6 19.1/25.6 25.6 25.6 25.6 25.6
36.0 27.0/31.3 27.0 21.6 9.0 7.3
24 24 24 24 24 24
5B 5B 5B 5B 5B 5B
650 650 650 650 650 650
970 970 970 970 970 970
37 ° 37 ° 37 ° 37 ° 37 ° 37 °
208 208/240 277 347 480 600
1600 1600 1600 1600 1600 1600
1/30 1/30 1/30 1/30 1/30 1/30
9 9 9 9 9 9
14 14 14 14 14 14
18 18 18 18 18 18
AWG 6 AWG 8 AWG 8 AWG 14 AWG 14 AWG 14
38 38 38 38 38 38
muh-10-8 muh-10-2 muh-10-7 muh-10-3 muh-10-4 muh-10-6
208 208/240 277 347 480 600
1-3Ø 1-3Ø 1Ø 1Ø 3Ø 3Ø
10.0 7.5/10.0 10.0 10.0 10.0 10.0
34.1 25.6/34.1 34.1 34.1 34.1 34.1
48.0 36.0/42.0 36.0 28.8 12.0 9.7
24 24 24 24 24 24
5B 5B 5B 5B 5B 5B
650 650 650 650 650 650
970 970 970 970 970 970
49 ° 49 ° 49 ° 49 ° 49 ° 49 °
208 208/240 277 347 480 600
1600 1600 1600 1600 1600 1600
1/30 1/30 1/30 1/30 1/30 1/30
9 9 9 9 9 9
14 14 14 14 14 14
18 18 18 18 18 18
AWG 4 AWG 6 AWG 6 AWG 14 AWG 14 AWG 14
38 38 38 38 38 38
muh-15-8 muh-15-2 muh-15-4 muh-15-6
208 208/240 480 600
1-3Ø 3Ø 3Ø 3Ø
15.0 11.2/15.0 15.0 15.0
51.2 38.2/51.2 51.2 51.2
72.0 31.3/36.1 18.0 14.5
24 24 24 24
5A 5C 5C 5C
910 910 910 910
1640 1640 1640 1640
52 ° 52 ° 52 ° 52 °
208 208/240 480 600
1530 1530 1530 1530
1/20 1/20 1/20 1/20
11 11 11 11
20 20 20 20
35 35 35 35
AWG 2 AWG 6 AWG 10 AWG 12
53 53 53 53
muh-20-8 muh-20-2 muh-20-4 muh-20-6
208 208/240 480 600
3Ø 3Ø 3Ø 3Ø
20.0 15.0/20.0 20.0 20.0
68.2 51.2/68.2 68.2 68.2
56.0 41.2/48.0 24.0 19.3
24 24 24 24
5A 5C 5C 5C
1320 1320 1320 1320
2060 2060 2060 2060
48 ° 48 ° 48 ° 48 °
208 208/240 480 600
1500 1500 1500 1500
1/10 1/10 1/10 1/10
12 12 12 12
23 23 23 23
41 41 41 41
AWG 4 AWG 4 AWG 10 AWG 12
60 60 60 60
muh-25-2 muh-25-4 muh-25-6
208/240 480 600
3Ø 3Ø 3Ø
18.7/25.0 25.0 25.0
63.8/85.2 85.2 85.2
52.0/60.0 30.0 24.2
24 24 24
5A 5C 5C
2100/1800 2100/1800 2100/1800
2100/2030 2100/2030 2100/2030
38 °/44 ° 38 °/44 ° 38 °/44 °
208/240 480 600
1600/1375 1600/1375 1600/1375
1/4 1/4 1/4
13 13 13
23 23 23
50 50 50
AWG 3 AWG 8 AWG 10
93 93 93
muh-30-8 muh-30-2 muh-30-4 muh-30-6
208 208/240 480 600
3Ø 3Ø 3Ø 3Ø
30.0 22.5/30.0 30.0 30.0
102.3 76.7/102.3 102.3 102.3
84.0 63.0/72.3 36.0 29.0
24 24 24 24
5A 5A 5C 5C
2100/1800 2100/1800 2100/1800 2100/1800
2100/2030 2100/2030 2100/2030 2100/2030
45 °/53 ° 45 °/53 ° 45 °/53 ° 45 °/53 °
208 208/240 480 600
1600/1375 1600/1375 1600/1375 1600/1375
1/4 1/4 1/4 1/4
12 12 12 12
20 20 20 20
50 50 50 50
AWG 1 AWG 2 AWG 6 AWG 8
93 93 93 93
muh-40-2 muh-40-4 muh-40-6
208/240 480 600
3Ø 3Ø 3Ø
30.0/40.0 40.0 40.0
102.3/136.4 136.4 136.4
83.4/96.4 48.0 38.7
24 24 24
5A 5A 5A
3000/2600 3000/2600 3000/2600
3260/2900 3260/2900 3260/2900
42 °/49 ° 42 °/49 ° 42 °/49 °
208/240 480 600
1525/1420 1525/1420 1525/1420
1/2 1/2 1/2
15 15 15
28 28 28
60 60 60
AWG 1/0 AWG 4 AWG 6
114 114 114
muh-50-8 muh-50-2 muh-50-4 muh-50-6
208 208/240 480 600
3Ø 3Ø 3Ø 3Ø
50.0 37.5/50.0 50.0 50.0
170.5 139.0 127.3/170.5 104.2/120.4 170.5 60.2 170.5 48.3
24 24 24 24
5A 5A 5A 5A
3000/2600 3000/2600 3000/2600 3000/2600
3260/2900 3260/2900 3260/2900 3260/2900
53 °/61 ° 53 °/61 ° 53 °/61 ° 53 °/61 °
208 208/240 480 600
1525/1420 1525/1420 1525/1420 1525/1420
1/2 1/2 1/2 1/2
15 15 15 15
25 25 25 25
60 60 60 60
AWG 4/0 AWG 3/0 AWG 4 AWG 3
114 114 114 114
eLectRicaL Data cat. No.
voLtS
phaSe
kw
muh03-81 muh03-21 muh03-71 muh03-31 muh03-41 muh03-61
208 208/240 277 347 480 600
1Ø 1Ø 1Ø 1Ø 3Ø 3Ø
muh05-81 muh05-21 muh05-71 muh05-31 muh05-41 muh05-61
208 208/240 277 347 480 600
muh-07-8 muh-07-2 muh-07-7 muh-07-3 muh-07-4 muh-07-6
aiR DeLiveRy Data
Note: 1. All standard units are supplied with a low voltage control transformer and contactor (24V) except MUH-03 & 05, 208, 240 & 277 volt models. Low voltage control on these units are available on made to order. All units are also available on special order for 120 volt control; internal and transformer or external without transformer. 2. On dual voltage units; CFM, FPM, and RPM are shown at higher voltage.
ZBL-QMUHO
10-06
faN motoR Data
3. 4. 5A. 5B. 5C.
On dual phase units, maximum amp draw is listed for respective voltage. 25 thru 50 KW models have two speed motors and dual CFM ratings. Standard. Optional - made to order - amp load unbalanced on 3 Phase. Optional - made to order - amp load balanced on 3 Phase.
acceSSoRieS DeScRiptioN
cataLog #
eLectRicaL RatiNg
uSe with heateR No.
mt-1
Single Pole Internal Thermostat Temp. Range: 40°F - 85°F
25A; 120, 240V. A.C. Res. 22A; 277V.A.C. Res.
All MUH Series Heaters (except MUH05-21 3Ø and mUH025-81 3Ø, which use MT-2).
mt-2
Two Stage Internal Thermostat Temp. Range: 40°F - 85°F
MUH05-21 3Ø, MUH05-81 3Ø, MUH-15-8, MUH-20-8, MUH-25-2, MUH-30-2, MUH-30-8, MUH-40-2, MUH-50-2, MUH-50-4, MUH-50-8
mcfS mRfS-1
Internal Summer Fan Switch
25A; 120, 240V. A.C. Res. 22A; 277V.A.C. Res. 125V.A; Pilot Duty 6A; 600V.A.C. Res. 2 HP; 250, 480, 600V.A.C. 1, 2, or 3Ø 2 HP; 250-480V.A.C. 6 AFL, 35 ALR, 250V.A.C. 60 Hz 3 AFL, 18 ALR, 480V.A.C. 60 Hz 6 AFL, 35 ALR, 250V.A.C. 60 Hz 3 AFL, 18 ALR, 480V.A.C. 60 Hz
All MUH Series Heaters (except MUH03-21, MUH03-71, MUH03-81, MUH05-21, MUH05-71, MUH05-81 Units, unless optional control transformer is supplied.
mpDS-25 Power Disconnect Switch (3 Pole)
25A, 600V.A.C. Res.
MUH03-21, MUH03-41, MUH03-71, MUH03-81, MUH05-21, MUH05-41, MUH05-71, MUH05-81, MUH-07-4, MUH-10-4, MUH-15-4, MUH-20-4
mpDS-60 Power Disconnect Switch (3 Pole)
63A, 600V.A.C. Res.
MUH-07-02, MUH-07-7, MUH-07-8, MUH-10-2 ,MUH-10-7, MUH-10-8, MUH-15-2 MUH-15-8 3Ø only, MUH-20-2, MUH-20-8, MUH-25-2, MUH-25-4, MUH-30-4 MUH-40-4, MUH-50-4
NRfS-2 mhRt
Remote Summer Fan Switch (Line Voltage) Remote Summer Fan Switch with Relay (24V Coil-Single Pole Normally Open) Heater Recovery Thermostat with Relay (24V Coil-Single Pole Normally Open) Hi — 120°F; Low — 60°F
uNiveRSaL waLL & ceiLiNg bRacket cataLog No.
uSeD oN
All MUH Series Heaters All MUH Series Heaters All MUH Series Heaters (except MUH03-21, MUH03-71, MUH03-81, MUH05-21, MUH05-71, MUH05-81 Units, unless optional control transformer is supplied.
bRacket Size DimeNSioN
3 - 20kw
25 - 50kw
optioNaL buiLt-iN coNtRoLS aND acceSSoRieS oN muh heateRS factoRy iNStaLLeD oNLy††
mmb-10
MUH-03, 05, 07 & 10
a
71/4”
97/16”
mmb-20
MUH-15 & 20
b
91/2”
143/8”
DeScRiptioN
mmb-30
MUH-25 & 30
c
71/4”
121/8”
mmb-50
MUH-40 & 50
D
115/16”
21/16”
MUH-03 & 05 (208, 208/240, 277V Supply) 24 or 120V Control Transformer and Power Contactor 24 or 120V H.C. Power Contactor
e
21/4”
3”
L
201/2”
2815/16”
MUH-03 & 05 (480V Supply) & MUH-07 thru MUH-50, Optional 120V Control
m
915/16”
1415/16”
2-Stage Control of Elements (See Note 5)
N
31/4”
41/2”
ceiLiNg bRacket cataLog No.
uSeD oN
mcmb-10
MUH-03, 05, 07 & 10
mcmb-20
MUH-15 & 20
mcmb-30
MUH-25 & 30
mcmb-50
MUH-40 & 50
Manual Reset. Outlet Mesh (Bird Screen) For all MUH Heaters
optioNaL veRticaL ceiLiNg mouNtiNg bRacket cataLog NumbeR
uSeD oN
mvDmb5
MUH03-05
1
5
mvDmb20
MUH07-20
1
mvDmb50
MUH25-50
1
mouNtiNg LimitatioNS Unit heaters should not be used in potentially explosive atmospheres. The finish is not intended for direct salt spray exposure in marine applications or the highly corrosive atmospheres of swimming pools, chemical storage bins, etc. Do not install unit heaters above recommended maximum mounting height. Obstructions must not block unit heater air inlet or discharge. Heaters must be mounted at least 7’ above the floor to prevent accidental contact with the heating element or fan blade which could cause injury.
2
StaNDaRD caRtoN Qty. wt. LbS.
††Optional built-in controls and accessories factory installed only - Not to be field installed
DimeNSioNS cat. No.
height
muh-03 & 05
16”
wiDth Depth 14”
7
muh-07 & 10
213/4”
19”
71/2”
9
muh-15 & 20
213/4”
19”
123/4”
muh-25 & 30
30”
265/8”
113/4”
muh-40 & 50
30”
265/8”
171/8”
71/2”
DiffuSeR SeLectoR tabLeS foR veRticaL mouNtiNg cataLog No. NoNe NoNe NoNe NoNe NoNe NoNe
DeScRiptioN WITHOUT DIFFUSER No diffuser needed where a straight downflow air pattern is required. For maximum air throw, remove louvers. Any of three diffusers can be added to basic heater.
NoNe NoNe maD-S maD-m maD-m maD-m maD-L maD-L maD-L maD-L mLD-S mLD-m mLD-m mLD-m mLD-L mLD-L
ANEMOSTAT DIFFUSER The “comfort” diffuser. Produces draft-free air movement at low mounting heights. Floor coverage shown in table.
LOUVER DIFFUSER Permits directional (straight line) air flow as in air curtain application over doorways. Rectangular coverage, Louvers can be turned in either direction.
mLD-L mLD-L mRD-S mRD-m mRD-m mRD-m mRD-L mRD-L mRD-L mRD-L
cataLog No.
max. mNt. ht.
a DimeNSioN
muh-03 &muh-05 muh-07 & muh-10
9 14
18 26
muh-15 muh-20 muh-25 muh-30
20 23 23 20
35 40 63 55
muh-40 muh-50
28 25
70 63
muh-03 & muh-05 muh-07 & muh-10
8 12
18 28
muh-15 muh-20
15 17
35 40
muh-25 muh-30
19 17
60 55
muh-40 muh-50 muh-03 & muh-05 muh-07 & muh-10
22 20 9 14
77 70 25(A) 39 (A)
12(B) 19(B)
muh-15 muh-20
18 20
50(A) 56(A)
25(B) 28(B)
muh-25 muh-30
23 20
72(A)
36(B)
muh-40 muh-50
24 22
88(A) 80(A)
44(B) 40(B)
muh-03 & muh-05 RADIAL DIFFUSER muh-07 & muh-10 Increases floor coverage. Adjustable muh-15 fins, in vertical mode, direct muh-20 downward in a tight pattern. muh-25 Conversely, when fins are tilted to muh-30 45° angle, floor coverage is up to 25% greater at relatively low muh-40 mounting heights. muh-50
9 14
20 31
18 20
40 45
23 20
69 60
24 22
75 68
DiffuSeR patteRN aND aRea
type muh-35
uNit heateR FILE #E21609 • Mounts either on the wall or from the ceiling can be used for primary or spot heating. For factories, garages, schools, etc.
• Advanced pull-through air flow design draws air across heating element for more even air distribution and cooler element operation.
• Airflow can be directed horizontally, vertically or any position between for precise control.
• Specially designed venturi outlet to meet that added throw as required in vertical position.
• Multiple wattage heat selector switch. Either 5KW or 3.3KW @ 240V (3.7KW or 2.5KW @ 208V) for just the right amount of heat. • Fan only switch allows fan to cycle automatically with elements or run continuously for air movement when no heat is required. • Built-in bi-metal thermostat. Range 40° to 90°F. • Heater is shipped with ceiling/wall bracket. • Heavy gauge die-formed steel housing.
• Completely enclosed fan motor. • Aluminum-finned, copper clad steel sheath heating element has longer useful life, because of cooler sheath temperature and faster heat dissipation. • Automatic reset linear thermal cut-out capillary type, provides protection over entire length of element area. • Ruggedly built, yet lighter weight for easier installation. No piping flues, valves, or traps. • Meets all UL, NEC, and OSHA requirements.
3
SeLectioN chaRt cataLog NumbeR
muh-35
eLectRicaL Data voLtS
phaSe
240/208
1
aiR DeLiveRy Data
faN motoR Data
2 Stage coNtRoL eLemeNt coNtRoL voLtage
cfm
fpm
t(°f)
voLtS
Rpm
5.0/3.7 17.0/12.6 21.0/18.0 17.0/12.6 MUH-35
210
550
71°
240/208
1600
kw
btu/hR (000)
ampS
maximum effective mouNtiNg height
hp
hoRiz.
veRt.
hoRiz. aiR thRow
wiRe Size
iNStaLLeD weight (lbs) w/ bRacket
/100
8
51
24
AWG 10
22
1
aRchitect’S aND eNgiNeeR’S SpecificatioNS* • Unit mounts either horizontally or vertically. Totally versatile. For factories, warehouses, garages, stores, shipping rooms, power stations, aircraft hangers. Can be used for primary, supplementary, spot, or dual-system heating. Wide range of optional control kits are field installable, increasing the MUH adaptability to the specification market. • Forced air unit heater with 10 power ratings; from 3KW to 50 KW heating output; 208, 240, 277 and 480V, 10,230 to 170,500 • BTU/hr. • 32 compatible models (no need to try to assemble a heating system from 70 or 80 models!) • Heavy gauge die-formed steel housing. Two-toned, smartly styled. • Advanced pull-through air flow design draws air across heating element for more even air distribution and cooler element operation. Specially designed venturi outlet to meet that added throw as required in vertical position. • Branch circuit fusing (when required). • Completely enclosed fan motor. • 1or 3-phase wiring on 5 through 10 KW 208/240V and 15 KW 208V units (field interchangeable). • Aluminum-finned, copper clad steel sheath heating element has longer useful life, because of cooler sheath temperature and • faster heat dissipation. • 24V control transformer standard on most models, providing a safer and more accurate means of temperature control. 3KW and 5KW, 208-277V, have line voltage controls as standard (24V control available on made-to-order basis). Automatic reset linear thermal cut-out, capillary type, provides protection over entire length of element areas (Manual reset • protection available on made-to-order basis). • 2-speed fan selector switch (25 to 50 KW models). • Fan delay feature eliminates cold drafts. Element heats up before fan cuts in, then fan continues to distribute heat after element shuts off. Ruggedly built, yet lighter weight for easier installation. No piping flues, valves, or traps. • Individually adjustable discharge louvers to control air flow. • Choice of optional diffusers for variety of air patterns, maximizing heat concentration and coverage in the vertical position. • Meets all UL, NEC, and OSHA requirements. • *QMark reserves the right to make changes without prior notice.
470 Beauty Spot Road East Bennettsville, SC 29512
